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N. PETERS. PHOYQLITHDGRAPHER. WASHINGTON D C UNITED STATES PATE@ JOHN F. HOLT, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR TO \VOON SOCKET RUBBER COMPANY.

ROLLER FOR CLOTHES-WRINGERS.

Specification forming part 0f Letters Patent No. 49,030, dated July 25, 1865.

To all 'whom it may concern Be it known that I,JOHN F. HOLT, of Providence, in the county of Providence and State of Rhode Island, have invented a new and useful Improvement in Rolls for Clothes-Wrin gin g Machines and other Similar Purposes; and l do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, making part of this specication, in which-4 Figure 1 is a longitudinal view of my improved roll complete; and Fig. 2 is a sectional view of the same, which exhibits the improved mode of its construction.

Similar letters of reference indicate corresponding parts in both gures.

My invention relates to a mode of securing a cylinder of india-rubber or a like suitable material in a permanent and substantial manner upon a mandrel or shaft to form a useful and serviceable roll for wringing or squeezing clothes in well-known machines for that purpose, and for other similar uses and purposes.

The great difficulty which has hitherto been experienced in the application of india-rubber, gutta-percha, and like material in the construction of rolls for the purpose mentioned is that of preventing the exterior cylindrical body ot' india-rubber, &c.,from becoming detached from and slipping on the mandrel instead of turning with it, in which case the roll is rendered permanently1 inoperative and useless; and although a great many ingenious contrivances have been employed to overcome this difculty I am not aware that any such have succeeded in doing so without rendering the roll otherwise objectionable.

My invention'for this purpose consists, first, in constructing the mandrel with a spiral groove in the portion occupied by the elastic cylinder of india-rubber or like material; second, in binding a preliminary sheet or thickness of the vulcanizable compound of indiarubber or like material upon such mandrel by means of any suitable inelastic cord, braid, or thong, which is wound over said sheet or thickness of material in the spiral groove in such a manner as to conne the material in unyielding spiral corrugations upon the mandrel to prevent its slipping thereon, and to lill the spiral groove, so as to present an even cylindrical surface tor the reception and continement ofthe body of the materialwhich constitutes the roll; third, in constructing the roll for the purpose specified by combining the spiral grooved mandrel, the mode described of binding thereon a preliminary thickness o t' india-rubber compound or vulcnnizable gum, and a suitable cylindrical body of the same material, and afterward curing and thereby fusing the whole together on the mandrel by the process of vulcanizing,77 so called, as hereinafter specified.

To enable others skilled in the art to make and use my invention, I. will proceed to describe the same.

In the drawings, A is the mandrel, and (l d is the spiral groove, cut or otherwise formed therein in the same manner as a screw-thread is formed, except that for this purpose the form of the groove is -best made semicircular, and at the termination ot' the groove at each end there is made a semicircular score, c, directly1 round the mandrel, to receive the end of the bindingthong f. There are also on the mandrel two fixed collars, q g', near the circular score c, between which the elastic material of the roll is held and confined to prevent any endwise or lateral movement of the same on the mandrel.

The mandrel may be of either wood or metal, and the spiral grooves or scores may be cut therein in the usual way of cutting a screwthread, or bycastin g the mandrel in such form, which being done the elastic roll is formed thereon in the following manner, viz: The grooved portion ot' the mandrel between the collars is wrapped with a suitable thicknesssay one-sixteenth (1-16) of an inch-of the soft compound of india-rubber or other vulcanizable gum, h, completely enveloping this portion of the mandrel. I then prepareasuitable binding cord or thong, n, which may consist of a single cord, or three or more strands of cotton or other twine or cord braided together, and this I saturate or coat with.indiarubber cement, so called 5 or the binding device may consist of a strip of metal-brass, copper, or ironof a form and size that will, when wound upon the rubber in the groove, t and completely till lthe same. The thong or binding device thus l'ormed and prepared I wind in the spiral groove of the mandrel from the score e at one end to the like score at the other end upon the rubber compound or preliminary sheet, which is thus compressed into a spiral corrugated form and bound tightly iu the groove, forming, as it were, a female screw of indiarubber corresponding with the male screw on the mandrel, and presenting, by a combination of the binding braid or thong with the portion of the rubber compound which protrudes between the convolutions ot' the binding, an even and regular cylindrical surface, to and with which a subsequent thickness or body ofthe rubber compound or like material would adhere and unite, it' properly applied, as well to the binding covered with the cement as to the rubber compound itself. After the preliminary thickness 7L of material is thus bound and secured on the mandrel I Wrap the surface thus formed with the vulcanizable compound of india-rubber or like gum by Winding a sheet of the same thereon until a suliicient thickness or body is obtained to form the diameter of roll L required. Ihe roll L is then subjected to the well-known process of vulcanizing india-rubber and like gums, which unites the body of the compound last put in solidly with that which is bound upon the mandrel, confining the whole securely and permanently thereto and rendering the roll elastic and tit for use.

Instead ot' forming or constructing the roll i L of india-rubber permanently upon the mandrel, as above described, I contemplate, by means ofthe process above described, constructing the rubber portion in the same manner upon a temporary mandrel formed like that shown and described, except that the semicircular scores e are omitted, so that the indiarubber cylinder L, after being vulcanized, may be unscrewed from the temporary mandrel upon which it was formed or made up, as described, and screwedon the mandrel to which it is to be permanently confined for use on the machine, in which case one only of the collars, g, is fixed on the mandrel, the other one, g, being removable by means of a screwthread cut therein and on the mandrel to admit of the screwing of the rubber cylinder thereon.

It will be seen that the mode described of binding a preliminary thickness of india-rubber compound on the mandrel formed as described forms a complete and perfect screw-- thread within the rubber cylinder, which derives greater firmness from the inelastic binding device, and is therefore the more substantial and effective as a means of confining the cylinder on the mandrel than could be obtained by any process at present known to me of molding in the rubber itself, although approximate results may be obtained by so molding the rubber in connection with a mandrel substantially like that described.

lhat l claim, and desire to secure by Letters JOHN F. HOLT.

lVitnesses:

ISAAC A. BRowNELL, D. K. HoXsIE. 

